O.K. I removed the tallboy seat and put the original low rider seat on. Same thing. It seems there is too much play in the slot for the seat blade. I took the strap off. Now I can undo the knurled finger bolt at the rear of the seat and change seats in a jiffy. I also cut down the seat blade rubber shipping protector to a size that I could fold over the blade and installed it on the bike with the seat. 90& of the movement is gone. I am going to make a mold of the slot on the frame that contains the seat blade and make a permanent filler that I can slip on and off when I change seats. I will use the stock low rider seat for solo and change to the tallboy with the wider back pad for spousal visits.

Any questions?